   [concept-id revision-id]
   (let [response (client/get (str concepts-url concept-id "/" revision-id)
                              {:accept :json
-                              :throw-exceptions false})
+                              :throw-exceptions false
+                              :connection-manager (conn-mgr)})
         status (:status response)]
     (if (= status 200)
       {:status status :concept (parse-concept response)}

                              {:body (cheshire/generate-string concept)
                               :content-type :json
                               :accept :json
                               :throw-exceptions false})
        status (:status response)
        body (cheshire/parse-string (:body response))
        {:strs [revision-id concept-id errors]} body]

  [concept-id revision-id]
  (let [url (format "%sforce-delete/%s/%s" concepts-url concept-id revision-id)
        response (client/delete url
                                {:throw-exceptions false
                                 :connection-manager (conn-mgr)})
        status (:status response)
        body (cheshire/parse-string (:body response))
        {:strs [revision-id errors]} body]
